1. Introduction to Android

2. Introduction to Android
What is Android?
Android is a mobile operating system.
A modified version of Linux
Google bought Android from another company in 2005
Android is open source
Android comes in several versions
Some versions are for Smart Phones
Some versions are for Tablet computers
Introduction to Android

3. Architecture of Android
Figure from
Introduction to Android

4. Android Java API vs. Ordinary Java API some examples
Java API present in Android
Java API NOT present in Android
java.beans
java.io
java.lang
Runnable, Thread, etc.
java.net
Socket, etc.
java.util
List, Set, Map, etc.
java.util.concurrent
Executors, ExecutorService
java.applet
java.awt
GUI event listeners
javax.swing
GUI components
Introduction to Android

5. Introduction to Android
The necessary tools
Java JDK
Android applications are written using the Java programming language
Android SDK
Libraries, emulators, debugger, etc. specific to Android.
Android Studio
An IDE (Integrated Development Enviroment)
Genymotion
Emulators, to run Android apps on a normal computer
Introduction to Android

6. Android application development with Android Studio
How to get started
Create an Android project
Choose a build target
I usually chose Android 4.x
Add a few UI components to main.xml
Override the onCreate() method in your Activity
Start the emulator
Takes some time …
Run the application in the emulator
Introduction to Android

7. What’s in a Android application? Some Eclipse folders
java
.java source files.
This is where you program your Activities
res.drawable
Pictures, etc. In different resolutions (high, low, medium)
res.layout
XML files describing user interfaces
res.values.strings.xml
XML file with constant strings, like application name, etc.
AndroidManifest.xml
XML file describing the Android application
Introduction to Android